PM_25_B(:,1) = (NO3(:,1)+SO4(:,1)+A_VOC(:,1)+A_VOC(:,2)+A_VOC(:,3)+A_VOC(:,4) + A_VOC(:,5) +B_VOC(:, 1) + PM_25_Primary(:,1) +  PM_25_Primary(:,2) + PM_25_Primary(:,3) + PM_25_Primary(:,4)+ PM_25_Primary(:,5)+NH4);